I think i am about to venture into the SLR world. I have had those single shot cameras for awhile (digital of course) and want to go back to a bit more refined photography. I used to only use 35mm cameras.

I've pretty much decided the the Canon Rebel XTi is the right way for me to go but i'm confused about what type of lens to buy.

I'm looking for more then just the basic lens that comes with it, but don't want to be switching and changing lens all the time.

One benefit of the single shots is that they are convenient.

Any suggestions on what type and size lens would be a good one for a new camera owner, with a limited budget?